The point is, you want to match your shop conditions as closely as possible to the conditions where the piece will live the rest of its life. Obviously if you're shipping pieces across the country this will be impossible, and frankly, unless you're in a basement or an otherwise perfectly sealed and conditioned shop the way your house is, you'll only be able to get close. Fortunately, close is good enough. Use properly dried lumber and follow proper acclimation and milling procedures, build your furniture with movement in mind, and you'll be fine. Once you understand how and why wood moves, your fight with movement turns into more of a dance.